STMicroelectronics LDK130M18R

Overview

LDK130M18R from STMicroelectronics is an AEC-Q100 Grade 1 automotive-qualified low-dropout linear regulator in SOT23-5L package, delivering 300 mA output with 100 mV typical dropout at 100 mA, ±2.0% output voltage tolerance at 25 °C, 30 µA typical quiescent current, and 51 µV_RMS output noise (10 Hz–100 kHz) - deployed in ADAS power rails and automotive point-of-load systems.

For engineers reviewing the LDK130M18R datasheet, LDK130M18R pinout, LDK130M18R application, or LDK130M18R equivalent, key selection criteria include automotive-grade thermal robustness (−40 °C to 125 °C), ceramic-capacitor compatibility (1 µF C_OUT), logic-controlled shutdown (<1 µA OFF current), and fixed 1.8 V output with tight initial accuracy.

Technical Context

The LDK130M18R implements a PMOS pass transistor architecture enabling ultra-low dropout and stable operation with minimal external components. Its internal bandgap reference and error amplifier maintain regulation across input voltages from 1.9 V to 5.5 V while supporting fast transient response during load steps up to 300 mA.

It integrates logic-level enable control (V_EN high = active, low = shutdown), internal current limiting, and thermal shutdown with 160 °C trip point and 20 °C hysteresis. The fixed 1.8 V output version eliminates external feedback resistors and uses the BYP pin for optional noise-reduction capacitor connection.

Key Specifications

Pinout & Package

SOT23-5L package: 2.9 mm × 1.6 mm × 1.1 mm body, 5-pin surface-mount, gull-wing leads, RoHS-compliant ECOPACK2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise automotive LDO applications.

Compared with TPS78018 and NCP114AMX180TBG, the LDK130M18R uniquely combines Grade 1 temperature range, 300 mA capability, and 51 µV_RMS noise - making it the only option qualified for high-reliability ADAS power delivery where all three attributes are simultaneously required.

Availability

LDK130M18R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment processors, and body control unit sensor interfaces requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LDK130M18R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, and automotive-grade analog devices.

The LDK130 series belongs to ST's automotive-optimized LDO portfolio, engineered specifically for low-noise, low-quiescent current point-of-load regulation in safety-critical ADAS and infotainment systems.

FAQ

What is the exact output voltage tolerance of LDK130M18R over temperature?

The LDK130M18R has ±2.0% output voltage tolerance at 25 °C and ±3.0% over the full operating junction temperature range (−40 °C to +125 °C), as specified in Table 4 of DS9465 Rev 10. This includes line, load, and temperature effects combined.

Can LDK130M18R operate with a 1.9 V input and deliver full 300 mA at 1.8 V output?

Yes - at 100 mA, dropout is 100 mV typ.; at 300 mA and 40–125 °C, dropout rises to 200–400 mV. With 1.9 V input, minimum sustainable output is 1.8 V − 0.4 V = 1.5 V, so full 300 mA at exactly 1.8 V requires ≥2.2 V input per datasheet limits.

Is the BYP pin required for stability with 1 µF C_OUT?

No - the BYP pin is optional and used only to reduce output noise. Stability is guaranteed with 1 µF ceramic C_OUT regardless of BYP connection. If unused, BYP must be left floating with no PCB trace, per Table 1 and Figure 3.

Does LDK130M18R support reverse polarity protection on the IN pin?

No - the device lacks integrated reverse-voltage protection. Absolute maximum rating specifies VIN ≥ −0.3 V; applying reverse polarity risks permanent damage. External protection (e.g., series Schottky diode) is required in systems prone to battery reversal.